ZOO 2090 Study Guide - Midterm Guide: Aquatic Feeding Mechanisms, Bony Labyrinth, Gastralium
17 Nov 2016
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Document Summary
Homologous character: share a common ancestry from the same ancestral trait. Analogous character: same function but not necessarily the same ancestry. Phylogeny: genealogy (historical relationship) od species or higher taxa. Monophyletic group: group that includes the most recent common ancestor and all its descendants. Marine deuterostomes with radial symmetry as adults and bilateral symmetry as larvae. Characteristics of chordates: a notochord at some stage of life. Keeps body straight, promotes or organizes embryonic development: a dorsal, hollow nerve cord. Formed by invagination at the surface of the ectoderm: a pharynx with pouches or slits. Creates a water current between the mouth and pharynx, feeding and then evolved to respiration: a postanal tail, endostyle or thyroid gland. Glandular groove in the floor of the pharynx filter feeding and iodine metabolism. Fossil record: most direct, but never complete. Phylogenetic approach: using shared derived characters to determine common ancestry.
